StackOverflow2013

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2013-01-25T18:31:16.920
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2013-01-25T18:31:16.920
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Tomaka17's excellent answer gave me a good start toward solving an analogous problem using Qt QIODevice rather than std::istream. I found I needed to blend aspects of Tomaka17's solution, with aspects of the related experience at <a href="http://cdry.wordpress.com/2009/09/09/using-custom-io-callbacks-with-ffmpeg/">http://cdry.wordpress.com/2009/09/09/using-custom-io-callbacks-with-ffmpeg/</a> My custom Read function looks like this: <pre><code>int readFunction(void* opaque, uint8_t* buf, int buf_size) { QIODevice* stream = (QIODevice*)opaque; int numBytes = stream->read((char*)buf, buf_size); return numBytes; } </code></pre> ...but I also needed to create a custom Seek function: <pre><code>int64_t seekFunction(void* opaque, int64_t offset, int whence) { if (whence == AVSEEK_SIZE) return -1; // I don't know "size of my handle in bytes" QIODevice* stream = (QIODevice*)opaque; if (stream->isSequential()) return -1; // cannot seek a sequential stream if (! stream->seek(offset) ) return -1; return stream->pos(); } </code></pre> ...and I tied it together like this: <pre><code>... const int ioBufferSize = 32768; unsigned char * ioBuffer = (unsigned char *)av_malloc(ioBufferSize + FF_INPUT_BUFFER_PADDING_SIZE); // can get av_free()ed by libav AVIOContext * avioContext = avio_alloc_context(ioBuffer, ioBufferSize, 0, (void*)(&fileStream), &readFunction, NULL, &seekFunction); AVFormatContext * container = avformat_alloc_context(); container->pb = avioContext; avformat_open_input(&container, "dummyFileName", NULL, NULL); ... </code></pre> Note I have not yet worked out the memory management issues.
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1. POReading a file located in memory with libavformat
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1. USChristopher Bruns
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